Method and apparatus for peak-to-average ratio reduction

摘要

Peak-to-average ratio reduction is achieved by detecting peaks in an original analog signal that exceed a given threshold. Segments of the original analog signal containing such peaks are treated (e.g., by attenuation) and a composite analog signal is assembled that includes treated and untreated segments of the original analog signal. The composite analog signal is processed to perform analog-to-digital conversion to generate a composite digital signal. Segments of the composite digital signal corresponding to the treated segments of the original analog signal are reverse-treated or otherwise treated again to undo treatment of the segments of the original analog signal. A final output digital signal is generated that corresponds to the original analog signal in digital form.

主权项

1. A method for reducing the peak-to-average ratio of an analog signal in a Digital Subscriber Line (DSL) system, the method comprising:
detecting one or more peaks exceeding a threshold value in an original analog signal; constructing a composite analog signal comprising untreated segments of the original analog signal that do not exceed the threshold value and treated segments of the original analog signal that include one or more peaks that exceed the threshold; converting the composite analog signal to a composite digital signal; constructing an output digital signal corresponding to the original analog signal by reverse-treating segments of the composite digital signal corresponding to the treated segments of the original analog signal, wherein the treated segments of the analog signal comprise segments wherein the analog signal has been attenuated and/or processed by a signal divider, and wherein the reverse-treated segments of the composite digital signal comprise segments wherein the composite digital signal have been re-scaled and/or processed by a signal multiplier.